# Relationship history for MSHA mine 3503307

Current hierarchy: **Debbie L  Spooner; Harold G  Coffelt; Yvonne K  Coffelt → Central Oregon Bentonite Company → Star #1-2-3**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Central Oregon Bentonite Company → Star #1-2-3; 1988-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jo Ann  Weaver  et al → Star #1-2-3; 1988-03-01 to 2025-01-17; source msha-controller-operator-history
- **controller_controls_operator:** Jo Ann  Weaver  et al → Central Oregon Bentonite Company; 1988-03-01 to 2025-01-17; source msha-controller-operator-history
- **controller_controls_mine:** Debbie L  Spooner et al → Star #1-2-3; 2025-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Debbie L  Spooner et al → Central Oregon Bentonite Company; 2025-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Yvonne K  Coffelt et al → Central Oregon Bentonite Company; 2025-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold G  Coffelt et al → Central Oregon Bentonite Company; 2025-01-18 to current/open; source msha-controller-operator-history